Subordinated Borrowings - Summary of Subordinated Borrowings (Parenthetical) (Detail) - USD ($) $ in Millions |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| USD 800 million fixed floating subordinated notes [member] | ||||||
| Disclosure of subordinated liabilities [Line Items] | ||||||
| Fixed floating subordinated notes | $ 800 | $ 800 | ||||
| Coupon rate | [1] | 5.50% | ||||
| Marginal basis points | 3.539% | |||||
| USD 800 million fixed floating subordinated notes [member] | Aegon Ltd. [member] | ||||||
| Disclosure of subordinated liabilities [Line Items] | ||||||
| Fixed floating subordinated notes | $ 800 | 800 | ||||
| Coupon rate | [1] | 5.50% | ||||
| USD 925 million fixed subordinated notes [member] | ||||||
| Disclosure of subordinated liabilities [Line Items] | ||||||
| Fixed floating subordinated notes | $ 925 | $ 925 | ||||
| Coupon rate | [2] | 5.10% | ||||
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